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Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Debt      
Remaining borrowing capacity $ 300.0    
Long-term Line of Credit 0.0 $ 0.0 $ 150.2
Line of Credit      
Debt      
Credit facility, total available credit $ 304.0